The Yak's of the Wastelands desert. Their coats are actually very thin and provide reflective fibers like that of polar bears. Translucent hairs. But keep the heat in during the cold nights.

The yak's provide milk, meat and materials to the tribes. Their hair spun into clothes, rugs and rope to sell. their milk to cheese and when the times comes, their meat to store and bones for tools and weapons.